Not blinged up enough yet :o I am going to get the windows tinted as its not standard on the Zetec. I must admit that I do try to drive my normal daily route at around 55 mph as its mainly motorways and so I guess I do get the best return on that. I haven't worked it out myself yet and do use the on board 'computer' but I have noticed since my mark 2 that I have longer intervals now between filling up. i've got a 1.8 zetec n mine came with tinted windows